Decompression

Decompression

2 Stage Decompression


Our decompression systems use pilot operated valves as a means of achieving two stage decompression.

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The objective is to gradually reduce the system pressure until the threat of decompression shock no longer a factor and at that point of the pressure reduction cycle, open a second valve with greater flow capacity which will allow the cylinder or vessel to complete the drain to reservoir (tank) cycle.
The relationship of decompression to pressure is complicated by cylinder or vessel diameter, length and diameter of hoses in the system. Each system may be unique and safe stage two decompression pressure should be determined based on testing by the OEM and then determining a safe PSI for each system design.
Product	Spec Sheet No.
Housings
SD2 Housing for Two Stage Decompression	1201268
SD842 Housing for Two Stage Decompression	1203114
Valves 
Used in conjunction with above housings for 2 stage decompression
Air Pilot, 1-1/2 GPM, Hex Base, N/C 1 to 2, Pilot to Open, Ratios to 255:1, Uni-directional	1201235
Air Pilot, 1-1/2 GPM, Tamper-Resistant, N/C 1 to 2, Pilot to Open, Ratios to 255:1, Uni-directional	1201457
Manually-Operated, 1-1/2 GPM, Hex Base, N/C 1 to 2, Push to Open Force (PSIx.013+15PSI)	1201499
2 Way, N/C, Pilot with Manual Override, Orifice Option	1202392